掺珊瑚砂粉砂浆抗硫酸镁侵蚀性能研究
Magnesium Sulfate Attack Resistance of Mortar with Coral Sand Powder
马英 1李淯伟 1邰安1
作者信息
- 1. 南京工业大学材料科学与工程学院,南京 211816
- 折叠
摘要
本文研究了硫酸镁作用下掺珊瑚砂粉(CSP)和辅助胶凝材料(SCMs)砂浆的抗硫酸镁侵蚀性能.在5和20 ℃硫酸镁溶液中侵蚀至365 d,通过外观、长度变化、抗压强度,结合X射线衍射谱和傅里叶变换红外光谱分析砂浆的抗硫酸镁侵蚀性能.发现在5 ℃的硫酸镁溶液中侵蚀至365 d时,掺CSP砂浆发生严重劣化.掺20％(质量分数)CSP的抗硫酸盐硅酸盐水泥比掺20％(质量分数)CSP的普通硅酸盐水泥表现出更好的抗硫酸镁侵蚀性能.在5℃下粉煤灰和矿渣有助于改善掺CSP砂浆的抗硫酸镁侵蚀性能,然而在20 ℃下硅灰降低其抗硫酸镁侵蚀性能.在5 ℃下掺CSP砂浆主要发生镁盐和碳硫硅钙石型硫酸盐侵蚀并伴随少量石膏生成,在20 ℃下主要发生镁盐和石膏型硫酸盐侵蚀.
Abstract
This paper investigated the magnesium sulfate resistance of mortar incorporating coral sand powder(CSP)combined with supplementary cementitious materials(SCMs).With erosion in magnesium sulfate(MgSO4)solution at 5 and 20 ℃ for 365 d,the magnesium sulfate attack resistance of mortar was analyzed through appearance,length change,compressive strength,X-ray diffraction pattern and Fourier transform infrared spectroscopy.It is found that the mortar with CSP deteriorates seriously when it is eroded to 365 d in magnesium sulfate solution at 5 ℃.Sulfate resistantance Portland cement(SRPC)with 20％(mass fraction)CSP exhibits better magnesium sulfate attack resistance than ordinary Portland cement(OPC)with 20％(mass fraction)CSP.Fly ash and slag can effectively improve the magnesium sulfate attack resistance of mortar with CSP at 5 ℃,while silica fume reduces the magnesium sulfate attack resistance at 20 ℃.At 5 ℃,the mortar with CSP mainly undergos magnesium and thaumasite sulfate corrosion accompanied by a small amount of gypsum generation,while at 20 ℃,magnesium and gypsum-type sulfate corrosion mainly occurs.
关键词
珊瑚砂粉/硫酸镁侵蚀/碳硫硅钙石/粉煤灰/矿渣/硅灰Key words
coral sand powder/magnesium sulfate attack/thaumasite/fly ash/slag/silica fume引用本文复制引用
基金项目
国家自然科学基金青年科学基金(51802151)
出版年
2024
国家科技期刊平台
NSTL
万方数据